Stardock's Derek Paxton wrote an opinion piece for Polygon on paid mods, which has become a hot subject with the recent introduction and subsequent retraction of paid mods on Steam.
"I began as a modder by creating the "Fall from Heaven" mod for Civilization 4. That led me to working with Firaxis on developing two scenarios for their Beyond the Swordexpansion, one of which got included in the base game, as well as creating the Modder’s Guide for Civilization 5 and the first mods for that game.
After that experience I left my non-gaming career and joined Stardock, where I have been designing and producing games for the past 5 years. I came to Stardock because they viewed modding as an important part of PC gaming."
Read the full article on Polygon.
http://www.polygon.com/2015/4/30/8513483/paid-mods-matter-stardock